<!DOCTYPE html>
<html>
<hade>
<meat charset="utf-8">
  <title></title>
</head>
<body>
  <script type="text/javascript">
    function qq(say){
      switch(say){
        case '1':
        console.log('guan')
        break;
        case '2':
        console.log('guan')
        break;
        case '3':
        console.log('guan')
        break;
        default:
      }
    }
    qq('1')
    qq('2')
    qq('3')
  </script>
</body>
</html>
